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Analog Devices Inc./Maxim Integrated MAX1793EUE18+
- Part No.:
- MAX1793EUE18+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX1793EUE18+.pdf
- Description:
- IC REG LIN POS ADJ 1A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,093
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Product details
Overview
MAX1793EUE18+ from Maxim Integrated is a low-dropout linear regulator (LDO) with fixed 1.8V output, delivering guaranteed 1A load current at 210mV dropout, ±1% output voltage accuracy over temperature, and 125µA ground current. It integrates an open-drain reset output with 4ms delay and operates from +2.5V to +5.5V input, targeting power rails in portable computing and communications equipment.
For engineers reviewing the MAX1793EUE18+ datasheet, MAX1793EUE18+ pinout, MAX1793EUE18+ application, or MAX1793EUE18+ equivalent, key selection criteria include dropout performance at 1A, reset threshold tolerance (90–96% VOUT), thermal shutdown at 170°C, low-noise operation (115µVRMS), and compatibility with 6.8µF low-ESR output capacitors.
Technical Context
The MAX1793EUE18+ uses an internal p-channel MOSFET pass transistor enabling low quiescent current (125µA at light load) and stable dropout behavior without base-drive losses. Its Dual Mode™ architecture selects between factory-trimmed 1.8V output (SET = GND) or adjustable mode (1.25V–5.0V) via external resistor divider.
Regulation relies on a precision 1.25V reference, error amplifier, and MOSFET driver controlling gate voltage of the pMOS pass device. The RST comparator monitors VOUT against 94% nominal threshold and holds low for ≥4ms after recovery, supporting reliable power-on-reset signaling in microcontroller systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±1% over -40°C to +85°C, ensuring stable core logic supply for low-voltage processors. |
| Dropout Voltage | 210mV at 1A load, enabling operation down to VIN = 2.0V - critical for extending battery runtime in single-cell Li-ion systems. |
| Ground Current | 125µA at 100µA load, minimizing standby power loss in always-on subsystems like real-time clocks or wake-up circuits. |
| Reset Threshold | 94% of nominal VOUT (1.692V), with 4ms release delay - provides clean, glitch-free POR signal timing for embedded controllers. |
| Output Noise | 115µVRMS (10Hz–1MHz), low enough to avoid interference in analog sensor interfaces or RF front-end biasing. |
| Shutdown Current | 0.1µA max when SHDN = GND, enabling ultra-low-power sleep states in portable instrumentation. |
| Thermal Shutdown | Activates at TJ = +170°C with ~20°C hysteresis, protecting against sustained overload or poor PCB thermal design. |
Pinout & Package
The MAX1793EUE18+ is housed in a 16-pin TSSOP-EP package with exposed thermal pad (EP), rated for 1.5W continuous dissipation at TA ≤ +70°C. The compact 5mm × 4.4mm footprint is 30% smaller than SOT223 and only 1.1mm high, optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8, 9, 16 | N.C. | No internal connection; must remain unconnected per datasheet to avoid parasitic coupling. |
| 2–5 | IN | Main input supply pins (internally tied); require 4.7µF bypass capacitor each to minimize source impedance and ensure stability. |
| 6 | RST | Open-drain reset output; sinks current when VOUT drops below 94% of 1.8V; requires external 100kΩ pullup to OUT or logic rail. |
| 7 | SHDN | Active-low enable; pulls OUT low via 5kΩ internal resistor and disables regulation when grounded, reducing IQ to 0.1µA. |
| 10 | GND | Power and signal ground; also functions as heatsink - must be soldered to large PCB ground plane with multiple vias. |
| 11 | SET | Voltage-setting input; tied to GND for 1.8V preset mode; left floating or improperly biased risks unintended adjustable-mode activation. |
| 12–15 | OUT | Regulated output terminals (internally connected); require 6.8µF low-ESR (≤0.5Ω) capacitor to GND for transient response and stability. |
| EP | Exposed Pad | Thermal and electrical ground; mandatory connection to PCB ground plane to achieve specified 1.5W power dissipation and thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Mode™ Output Selection | Factory-trimmed 1.8V output enabled by grounding SET pin; eliminates external resistors and layout complexity for fixed-voltage use cases. |
| p-Channel MOSFET Pass Device | Enables 210mV dropout at 1A with no base-drive current, maintaining <225µA quiescent current even in dropout - superior to bipolar-based LDOs. |
| Integrated Reset Output | Open-drain RST asserts low when VOUT falls 6% below 1.8V and holds for ≥4ms after recovery - delivers deterministic POR without external components. |
| Low-Noise Regulation | 115µVRMS output noise (10Hz–1MHz) supports noise-sensitive loads such as ADC references or RF synthesizer VCO supplies. |
| Robust Fault Protection | Combines short-circuit current limiting (1.1–3.3A), thermal shutdown at +170°C, and undervoltage lockout (2.0–2.3V) to survive system-level faults. |
Applications
| Notebook Computer Core Logic Rail | Cordless Telephone Baseband Processor Supply |
|---|---|
|
Use Scenario: Powering 1.8V I/O and core domains of Intel Atom or ARM Cortex-A series SoCs in ultraportable notebooks. IC Role / Device Role / Timing Role: Primary LDO delivering regulated 1.8V at up to 1A with tight DC accuracy and fast load-transient response. Use Value: 210mV dropout extends usable battery range by allowing operation until VIN drops to 2.0V, while ±1% accuracy ensures SoC timing margin compliance. |
Use Scenario: Supplying 1.8V digital baseband processor and memory interface in DECT cordless handsets. IC Role / Device Role / Timing Role: Low-noise, low-IQ regulator providing clean power during burst-mode RF transmission and deep-sleep states. Use Value: 115µVRMS noise prevents bit errors in high-speed serial links; 0.1µA shutdown current enables multi-week standby battery life. |
| Cellular Phone Application Processor Core | Handheld Instrument LCD Controller Supply |
|
Use Scenario: Delivering 1.8V core voltage to application processors (e.g., Qualcomm Snapdragon) in feature phones and early smartphones. IC Role / Device Role / Timing Role: High-current LDO with integrated reset used for safe boot sequencing and brownout detection. Use Value: RST output with 4ms delay meets ARM PMIC specification for controlled processor reset timing; thermal protection prevents damage during prolonged call sessions. |
Use Scenario: Powering 1.8V LCD controller ICs and touch-screen interface circuitry in portable multimeters and oscilloscopes. IC Role / Device Role / Timing Role: Stable, low-noise supply enabling accurate analog-to-digital conversion and flicker-free display operation. Use Value: 125µA ground current minimizes self-heating in sealed enclosures; 6.8µF output capacitor requirement simplifies BOM with standard ceramic parts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS79618DRBR | 1A, 1.8V fixed, 170mV dropout at 1A, 180µA IQ, no integrated reset output. | Lacks RST functionality; requires external supervisor IC for POR generation. | Select when reset is handled elsewhere and lowest possible dropout is prioritized over integrated fault signaling. |
| MCP1826T-1802E/DB | 1A, 1.8V fixed, 300mV dropout at 1A, 120µA IQ, thermal shutdown only - no reset or current limit. | No reset output or short-circuit protection; less robust under fault conditions. | Choose for cost-sensitive, non-critical applications where full fault coverage is not required. |
Compared with TPS79618DRBR and MCP1826T-1802E/DB, the MAX1793EUE18+ uniquely combines 210mV dropout, integrated 4ms reset, and comprehensive protection (thermal, short-circuit, UVLO) in a thermally enhanced TSSOP-EP package - making it optimal for safety- and reliability-critical portable power rails.
Availability
MAX1793EUE18+ is available at Aetrix Electronics and suitable for notebook computers, cordless telephones, and handheld instruments requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1793EUE18+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX1793 belongs to Maxim's low-dropout linear regulator product line, designed specifically for battery-powered portable electronics demanding high current, low IQ, and integrated system-level features like reset and thermal protection.
FAQ
What is the guaranteed output voltage accuracy of the MAX1793EUE18+ across temperature and load?
The MAX1793EUE18+ guarantees ±1% output voltage accuracy over the full operating temperature range (-40°C to +85°C) and load current (1mA to 1A), provided VIN exceeds VOUT by at least 0.5V. At TA = +85°C and IOUT = 250mA, accuracy degrades slightly to ±1.5%, and worst-case over all conditions is ±3%. This level of precision ensures reliable operation of 1.8V logic families without additional margining.
Does the MAX1793EUE18+ require external components to operate in fixed 1.8V mode?
Yes, but only minimal ones: a 4.7µF input capacitor (CIN) between IN and GND, and a 6.8µF low-ESR output capacitor (COUT) between OUT and GND. The SET pin must be connected directly to GND to select the factory-trimmed 1.8V output - no resistors or feedback network needed. The RST pin requires a 100kΩ pullup resistor to OUT or another logic rail to generate a valid reset signal.
How does the MAX1793EUE18+ behave during thermal overload?
When junction temperature exceeds +170°C, the MAX1793EUE18+ activates thermal shutdown, turning off the p-channel pass transistor to halt power delivery. The device remains latched off until junction temperature falls by ~20°C, then automatically resumes regulation. Under continuous short-circuit conditions, this results in pulsed output - a fail-safe mechanism preventing permanent damage while maintaining visibility of fault condition.
Can the MAX1793EUE18+ be used with ceramic output capacitors?
Yes - the MAX1793EUE18+ is explicitly designed for use with ceramic output capacitors. Its stability criterion requires COUT ≥ 6.8µF with ESR ≤ 0.5Ω, which is readily met by X5R/X7R surface-mount ceramics. These capacitors provide excellent transient response and low noise, aligning with the MAX1793EUE18+'s 115µVRMS noise spec and fast load-step performance shown in typical characteristics.
What is the function of the exposed pad (EP) on the MAX1793EUE18+ package?
The exposed pad (EP) on the MAX1793EUE18+ serves dual roles: it is electrically connected to GND and acts as the primary thermal conduction path from die to PCB. To achieve the rated 1.5W power dissipation and prevent thermal derating, EP must be soldered to a large copper area (≥1 in² recommended) or multiple thermal vias connecting to an internal ground plane - failure to do so severely limits safe operating current and risks thermal shutdown.
MAX1793EUE18+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Adjustable (Fixed)
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.25V (1.8V)
- Voltage - Output (Max):
- 5V
- Voltage Dropout (Max):
- -
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 200 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable, Reset
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
MAX1793EUE18+ FAQ
1.How can I place an order for MAX1793EUE18+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1793EUE18+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX1793EUE18+ reliable?
The price and inventory of MAX1793EUE18+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1793EUE18+ is usually 5 days.
3.What payment methods are accepted for MAX1793EUE18+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1793EUE18+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1793EUE18+?
MAX1793EUE18+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1793EUE18+ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX1793EUE18+?
For technical support, including MAX1793EUE18+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1793EUE18+ requirements.
6.How does Aetrix verify that MAX1793EUE18+ is sourced from the original manufacturer or authorized distributors?
All MAX1793EUE18+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX1793EUE18+ meets industry standards.
7.What is the process for return or replacement of MAX1793EUE18+?
All MAX1793EUE18+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1793EUE18+, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX1793EUE18+ part is unused and in its original packaging.
Return procedure for MAX1793EUE18+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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